File:Quartzite (roadcut west of Vandola, Virginia, USA) 2 (51724960071).jpg
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Summary
[edit]DescriptionQuartzite (roadcut west of Vandola, Virginia, USA) 2 (51724960071).jpg |
Quartzite is a common, crystalline-textured, intermediate- to high-grade metamorphic rock. It forms by metamorphism of quartzose sandstones or siltstones. Quartzite can be entirely composed of interlocking quartz crystals, or the original sand grains may still be visible. This rock is hard (H = 7), will not bubble in acid (unlike marble), and can be almost any color. The term “quartzite” has been used in geology to refer to crystalline, quartzose metamorphic rocks and to hard, well-cemented quartzose sandstones that have not been subjected to metamorphism. It is difficult to not call hard, well-cemented sandstones “quartzite” - for example, the Clinch Quartzite in the Appalachian Mountains and the Eureka Quartzite of the Great Basin in western USA, but the Clinch and Eureka aren’t metamorphic rocks. The term "metaquartzite" has been used by some geologists to refer to crystalline-textured, quartzose rocks that have been metamorphosed. This implies that “quartzite” be restricted to well-cemented, non-metamorphosed sandstones. I don’t often see the term metaquartzite in the geologic literature. The whitish quartzites seen here (interpreted as part of a metavolcanic unit) are Piedmont metamorphic basement rocks in Virginia. They are exposed in the footwall almost adjacent to a half-graben's eastern boundary fault, a normal fault (= obscured by vegetation at this locality). The hanging wall (a little north of this spot) consists of siliciclastic sedimentary rocks representing Triassic rift basin fill. The half-graben is the Danville Basin (Dan River Basin). Locality: Oak Ridge Farms Road Exit Ramp Outcrop - roadcut along both sides of north-bound exit ramp off Route 58, just west of the town of Vandola & west of Danville, southern Pittsylvania County, southern Virginia, USA (36° 34’ 30.09” North latitude, 79° 31’ 20.13” West longitude) |
Date | |
Source | Quartzite (roadcut west of Vandola, Virginia, USA) 2 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51724960071. It was reviewed on 19 January 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
19 January 2022
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current | 22:00, 19 January 2022 | 4,288 × 2,848 (7.54 MB) | SeichanGant (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D90 |
Exposure time | 1/80 sec (0.0125) |
F-number | f/6 |
ISO speed rating | 200 |
Date and time of data generation | 10:02, 10 November 2012 |
Lens focal length | 140 mm |
Width | 4,288 px |
Height | 2,848 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 20:42, 4 December 2021 |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 10:02, 10 November 2012 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 6.321928 |
APEX aperture | 5.169925 |
APEX exposure bias | 0 |
Maximum land aperture | 5.1 APEX (f/5.86) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 210 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Lens used | Tamron AF 18-270mm f/3.5-6.3 Di II VC PZD (B008) |
Serial number of camera | 3562538 |
Date metadata was last modified | 15:42, 4 December 2021 |
Unique ID of original document | A6251D00940A3A3CA83CCD6734A6DF29 |
IIM version | 2 |